today Mac OS X Mountain Lion will be released. Will it be compatible with the Arturia Software?

Hi

I would say yes. Lion to Mountain Lion I would say is similar to Snow Leopard from Leopard. Mountain Lion new features include a fair amount of IOS stuff to be in line with IOS 5 and their ipad iphone units, reminders, icloud, imessage etc. So unless they have re written any of their midi /usb drivers which is always a possibility with Apple, I would say it would just work as normal.

Saying this, I haven't tested any of the Arturia stuff with Mountain Lion

Works well here with Ableton Live 8.3.3. I did notice some graphics glitches using the Arturia Mini and Oberheim. I just purchased the V 3.0 collection so I am not sure if the Oberheim had graphics glitches before, but the Mini didn't on my machine. That all being said, besides that they're functioning in ML on my machine.